heart disease is the leading cause of death for both men and women, killing about 600,000 people in the u.s. every year. now a new study says changing over to a mediterranean diet could reduce that risk. as we report, this way of better health includes wine. >> reporter: the study compared the mediterranean diet to a low-fat diet among nearly 7,500 patients at high risk for heart disease. after five years, those on the mediterranean diet had 30% less heart attacks, strokes, or deaths from heart disease. dr. tara narulo is a cardiologist at lenox hill support. >> the study is significant because diet is one of the most underestimated and easy ways to change your cardiovascular risk profile. >> reporter: the mediterranean diet includes extra virgin olive oil, nuts, fresh fruits, vegetables, beans, fish, and poultry. it allows for seven or more glasses of wine a week.